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(No Model.) 3 Sheets-Sheet 1.

N. W. PRATT;

STEAM GENERATOR. No. 314,196 Patented Mar. 17, 1885.

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STEAMGENERATOR. No. 314,196. Patented Mar. 17, 1885.

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' N. W. PRATT.

STEAM'IGENEBATOR.

Patented Mar. 17\ 1885.

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NATHANIEL W. PRATT, BROOKLYN, ASSIGNOR TO THE BABCOOK & VVILCOX COMPANY, OF NEW YORK, N. Y.

JPECIFICATION forming part of Letters Patent No. 314,196, dated March 17,1885.

Application filed May 1'], 1884. (No model.)

To aZZ whom it may concern.-

Be it known that I, NATHANIEL W. PRATT, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Steam-Generators, (Case A,) of which the following is' a specification, reference being had to the accompanying drawings, forming a part of the same, in which Figure 1 represents a side elevation, partly in section; Fig. 2, an enlarged and detached sectional view of a cross-header and connected tube; Figs. 3 and 4, enlarged and detached views (longitudinal and in cross-section) of the flame-bridges; Fig. 5, a front elevation, partly in section; and Figs. 6, 7, S, and 9, detached and enlarged views in cross and vertical section of the drums and adjacent connections.

Similar letters of reference indicate corre sponding parts in the several figures.

This invention relates to certain improvements in that class of steam-generators known as sectional boilers, which, for the purposes of this application, are embodied in a type of generator known in commercial circles as the "Babcock & Wilcox Water-Tube Boiler, and upon which numerous patents have already been granted. This boiler, as originally designed, contains many parts of great weight and bulk, and consequently difficulties are met in transporting the same through remote and mountainous regions having bad roads; and, also, it has been necessary to employ a degree of skilled labor in setting up these boilers that cannot always be found in such remote districts. The object of this invention, therefore, is to avoid these difficulties by such modifications of the parts as will divide and reduce their weight and bulk, so that an easy transportation is made, even on mule-back, and upon arrival at their destination they may be readily assembled without the use of rivets or bolts or the employment of skilled labor.

The invention consists, principally, in dividing portions of the generator into separable parts, and connecting the same with expanded nipples adjacent to each other, so as to form communicating passages through the divided portions of the steam and water spaces.

The invention also consists in certain details of construction hereinafter fully described,and subsequently defined in the claims.

' In thedrawings, a a represent various sections of the steam and water drum, each section being provided with independent heads, and joined together by a number of nipples, h, expanded into the adjacent heads, which may be flat, convex, or concave in form, the latter, however, being preferred. A steamdome, m, is also shown connected therewith by means of nipples h, in the same manner.

The main water-tubes e e are expanded into the cross-headers d at their respective ends, which communicate with the drums a through the intermediate manifolds, b and c, as shown in Figs. 1 and 5, and in the enlarged and detached views, Figs. 6, 7, 8, 9. These manifolds are usually composed of cast metal, and are connected with each adjacent part by means of expanded nipples h.

The manifold h is connected near the rear end of the drum a, the shell of the latter being re-enfor'ced and strengthened at such connection by a strap, a, riveted thereon, and which compensates for the metal removed to accommodate the nipples, whicha're expand ed directly into the strap, as more fully shown in the enlarged view Fig. 6.

The circulating-tubes f f, that connect the manifold 12 with the cross-headerd of the main tubes 6, are expanded directly into such respective parts; or the manifold 12 may be dispensed with, and the circulating-tubes f extended and bent at their upper ends, and expanded directly into the strap a, as shown at s, Fig. 5.

The mud-drum g is also connected to the rear cross-header d by expanded nipples h, and is also divided into two or more parts, which are connected in the same way, as shown in Fig. 5.

In generators requiring extreme width of furnace, the cross-headers (I may also be divided and connected in the same manner, in which case the nipples h are expanded into the ad j acent ends.

The flame-bridges 'i z, in connection with the suspended bridge-wall 7c, determine the course of the gases from the furnace Z to the stack, as shown in Fig. 1.' These bridges are composed of east-iron plates that overlap each other, 5 and are bolted to bars 0 0 at their respective ends to retain them in place, as shown in the enlarged and detached views, Figs. 3 and 4, and also lined with protecting fire-brick upon their front, as shown in Fig. 1.

The side walls of the generator may be provided with doors, as shown at 10, Figs. 1 and 5,

to obtain access to the interior or to allow the introduction of a brush or jet in removing an accumulation of ashes upon the tubes or other I 5 parts.

Having thus fully described my invention,

what I claim, and desire to secure by Letters Patent, is

1.,A mud-drum composed of two or more sections joined together by a series of eX- panded nipples located near the top and bottom thereof, whereby communication is maintained when either becomes choked, as set forth.

2. A flame-bridge wall composed of a series of overlapping plates lined with firebrick and provided with side bars, substantially as described.

NAT. XV. PRATT. Vitnesses:

CHAS. W. FORBES, J. S, OALDW'ELL. 

